From f1993545cfe81512174d97e8382924049f6a8a97 Mon Sep 17 00:00:00 2001
From: David Schleef <ds@schleef.org>
Date: Tue, 12 Mar 2013 17:47:52 -0700
Subject: [PATCH] combdetect: switch to zebra striping

---
 gst/ivtc/gstcombdetect.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/gst/ivtc/gstcombdetect.c b/gst/ivtc/gstcombdetect.c
index 456b6bf116..1b709aaa4b 100644
--- a/gst/ivtc/gstcombdetect.c
+++ b/gst/ivtc/gstcombdetect.c
@@ -218,6 +218,7 @@ static GstFlowReturn
 gst_comb_detect_transform_frame (GstVideoFilter * filter,
     GstVideoFrame * inframe, GstVideoFrame * outframe)
 {
+  static int z;
   int k;
   int height;
   int width;
@@ -225,6 +226,8 @@ gst_comb_detect_transform_frame (GstVideoFilter * filter,
 #define GET_LINE(frame,comp,line) (((unsigned char *)(frame)->data[k]) + \
       (line) * GST_VIDEO_FRAME_COMP_STRIDE((frame), (comp)))
 
+  z++;
+
   for (k = 1; k < 3; k++) {
     int i;
     height = GST_VIDEO_FRAME_COMP_HEIGHT (outframe, k);
@@ -273,10 +276,10 @@ gst_comb_detect_transform_frame (GstVideoFilter * filter,
             thisline[i] = 0;
           }
           if (thisline[i] > 100) {
-            dest[i] = 255;
+            dest[i] = ((i + j + z) & 0x4) ? 235 : 16;
             score++;
           } else {
-            dest[i] = src2[i] / 2;
+            dest[i] = src2[i];
           }
         }
       }